Geometry vocabulary

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Across
  1. 2. Polygon with four equal sides
  2. 4. Angle formed by perpendicular lines
  3. 6. Number of sides in a quadrilateral
  4. 8. Another word for congruent
  5. 11. Number of equal sides in equilateral triangle
  6. 12. Place where lines intersect
  7. 13. Two angles added together
  8. 15. Triangle with no equal sides
  9. 17. Number of equal sides in isosceles triangle
  10. 19. Unit used to measure angles
  11. 20. Angle less than 90 degrees
  12. 21. A ruler measures this
Down
  1. 1. Pair of lines that never meet
  2. 2. Angle measuring 180 degrees
  3. 3. Base times height
  4. 5. 3-sided polygon
  5. 7. Angle between 108 and 30 degrees
  6. 9. Operation to find difference
  7. 10. Triangle with an angle over 90 degrees
  8. 12. Multiplication of numbers
  9. 14. Set of points passing through tow points
  10. 15. Angle measure in degrees for equilateral triangle
  11. 16. Corner point of angle
  12. 18. Number of obtuse angles in obtuse triangle
  13. 22. Sum of complementary angles in degrees